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Ok, maybe there would be a small reduction in pumping loss (from lower exhaust manifold pressure) with the wastegate open. I think the throttle is before the turbocharger inlet. That would be more efficient than having it between the turbocharger and the intake manifold. If you can measure intake manifold vacuum accurately you can see if there is a difference at a steady cruising speed between having the wastegate open or closed. If there really is a significant improvement in economy when the wastegate is open (indicated by more vacuum in the intake manifold), maybe you can connect something to open the wastegate at light throttle. It might involve blowing pressurized air into the servo unit.
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